/*
 * Copyright (C) 2010 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package piuk.blockchain.android.ui.zxing;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.PlanarYUVLuminanceSource;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;

import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;

import java.util.Map;

import piuk.blockchain.zxing.R;
import timber.log.Timber;

final class DecodeHandler extends Handler {

    private static final String TAG = DecodeHandler.class.getSimpleName();

    private final CaptureActivity activity;
    private final MultiFormatReader multiFormatReader;
    private boolean running = true;
    private RotationUtil _rotationHelper;

    DecodeHandler(CaptureActivity activity, Map<DecodeHintType, Object> hints) {
        _rotationHelper = new RotationUtil(activity);
        multiFormatReader = new MultiFormatReader();
        multiFormatReader.setHints(hints);
        this.activity = activity;
    }

    @Override
    public void handleMessage(Message message) {
        if (!running) {
            return;
        }
        if (message.what == R.id.decode) {
            try {
                decode((byte[]) message.obj, message.arg1, message.arg2);
            } catch (IllegalArgumentException e) {
                // Fix for https://github.com/journeyapps/zxing-android-embedded/issues/314
                Timber.e(e);
                // Quit process
                running = false;
                Looper.myLooper().quit();
            }

        } else if (message.what == R.id.quit) {
            running = false;
            Looper.myLooper().quit();

        }
    }

    /**
     * Decode the data within the viewfinder rectangle, and time how long it
     * took. For efficiency, reuse the same reader objects from one decode to the
     * next.
     *
     * @param data
     *           The YUV preview frame.
     * @param width
     *           The width of the preview frame.
     * @param height
     *           The height of the preview frame.
     */
    private void decode(byte[] data, int width, int height) {
        long start = System.currentTimeMillis();
        byte[] rotatedData = _rotationHelper.rotateImageData(data, width, height);
        if (_rotationHelper.flipWidthAndHeight()) {
            int tmp = width;
            width = height;
            height = tmp;
        }
        Result rawResult = null;
        PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(rotatedData, width, height);
        if (source != null) {
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
            try {
                rawResult = multiFormatReader.decodeWithState(bitmap);
            } catch (ReaderException re) {
                // continue
            } finally {
                multiFormatReader.reset();
            }
        }

        Handler handler = activity.getHandler();
        if (rawResult != null) {
            // Don't log the barcode contents for security.
            long end = System.currentTimeMillis();
            Log.d(TAG, "Found barcode in " + (end - start) + " ms");
            if (handler != null) {
                Message message = Message.obtain(handler, R.id.decode_succeeded, rawResult);
                // AP: we do not want a thumbnail of the captured private key flying
                // around
                message.sendToTarget();
            }
        } else {
            if (handler != null) {
                Message message = Message.obtain(handler, R.id.decode_failed);
                message.sendToTarget();
            }
        }
    }

}